The Collaborative International Dictionary of English v.0.48:

Turbinite \Tur"bi*nite\, n. [NL. Turbo, the generic name, fr. L.
   turbo a whirl, top: cf. F. turbinite.] (Paleon.)
   A petrified shell resembling a member of the genus Turbo.
   [R.]
   [1913 Webster]